Film:
* The Shape of Things (2003) - Adam Sorenson
* Never Been Kissed (1999) - Rob
* The Laramie Project (2002) - Matt
* Confidence (2003) - Jimmy
* Happy Feet (2006) - The penguin who sings "Happy Feet" (voice)
* The Boat That Rocked (2009) - Dave "The Pig" (also known as "Pirate Radio")
* The Words (2012) - Young Rory Jansen
* The Fifth Estate (2013) - Daniel Domscheit-Berg
* The Finest Hours (2016) - Richard Livesey
* The Sound of Music Live! (2013) - Max Detweiler
Television:
* Ed (2000-2004) - Martin "Marty" Sorenson (TV series)
* Law & Order: Special Victims Unit (2002) - Richard
* CSI: Miami (2005) - Dr. Lewis (1 episode)
* Numb3rs (2005) - Jason (1 episode)
* The Office (US) - Spencer (1 episode)
* Damages (2007) - Mark (1 episode)
* Person of Interest (2012) - Kevin (1 episode)
* Blue Bloods (2014) - Peter (1 episode)
* The Good Wife (2015) - David (1 episode)
* The Blacklist (2016) - David (1 episode)
* Better Call Saul (2018) - Jeff (1 episode)
* The Marvelous Mrs. Maisel (2018-2023) - Abe Weissman (TV series)
This is not an exhaustive list, but it captures some of Zak Orth's most notable roles. He is a versatile actor who has appeared in a wide range of projects.